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Continuous monitoring ofunderwater light in Indian River Lagoon: comparison of cosine and spherical sensors
| Title: | Continuous monitoring ofunderwater light in Indian River Lagoon: comparison of cosine and spherical sensors. |
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| Name(s): | Hanisak, M. Dennis | |
| Type of Resource: | text | |
| Genre: | Article | |
| Date Issued: | 1997 | |
| Publisher: | American Academy of Underwater Sciences | |
| Place of Publication: | Nahant, MA | |
| Physical Form: | ||
| Extent: | 16 p. | |
| Language(s): | English | |
| Identifier: | FA00007310 (IID) | |
| Note(s): |
The ecological importance of submerged aquatic vegetation (SAV) in estuaries and coastal zones throughout the world is well established. Water clarity and the availability of light determine seagrass productivity and abundance and the maximal depth to which different seagrass species will grow, or indeed, if they will grow at all. A comparison was made of continuous readings of underwater photosynthetically active radiation (PAR) and light attenuation (k) measured by two types of sensors (spherical and cosine), as part of a study on SAV-PAR interactions in Indian River Lagoon (Florida). The ratio of k calculated from cosine:spherical sensors was fairly constant; over the course of the whole year, cosine sensors provided estimates of k ca. 25% higher than those calculated from spherical sensors. Estimates of k ranged from 0.80-0.92 and 0.64-0.75, respectively, for cosine and spherical sensors. Although cosine sensors provided the same temporal (diel, monthly, and seasonal) patterns of PAR and k as spherical sensors, spherical sensors are recommended over cosine ones for future SAV/PAR monitoring because (1) spherical sensors measure all photons available for photosynthesis by seagrasses and other primary producers and (2) PAR and k are less quickly altered by sensor fouling. Florida Atlantic University. Harbor Branch Oceanographic Institute contribution 1219 This manuscript is an author version with the final publication available and may be cited as: Hanisak, M. D. (1997). Continuous monitoring of underwater light in Indian River Lagoon: comparison of cosine and spherical sensors. In E. J. Maney Jr. & C. H. Ellis Jr. (Eds.), Diving for Science 1997: proceedings of the American Academy of Underwater Sciences 1997 Scientific Diving Symposium (pp. 71-85). Nahant, MA: American Academy of Underwater Sciences. |
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| Subject(s): |
Indian River (Fla. : Lagoon) Underwater light Aquatic plants--Ecology Photosynthesis Light--Attenuation Sensors |
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| Persistent Link to This Record: | http://purl.flvc.org/fau/fd/FA00007310 | |
| Host Institution: | FAU |
